1536 Spaniard Pedro de Mendoza founds Buenos Aires, Argentina.
1806 British forces take Buenos Aires during the first British invasions of the Río de la Plata.
1806 Santiago de Liniers re-takes the city of Buenos Aires after the first British invasion.
1807 Second British invasion of the Río de la Plata; John Whitelock lands at Ensenada on an attempt to recapture Buenos Aires and is defeated by the locals.
1810 May Revolution: citizens of Buenos Aires expel Viceroy Baltasar Hidalgo de Cisneros during the ''May week'', starting the Argentine War of Independence.
1833 A big demonstration at the gates of the legislature of Buenos Aires forces the ousting of governor Juan Ramón Balcarce and his replacement with Juan José Viamonte.
1881 The Boundary treaty of 1881 between Chile and Argentina is signed in Buenos Aires.
1913 Buenos Aires,Argentina. The Buenos Aires Subway starts operating, it`s the first underground railway system in the southern hemisphere and in Latin America
1914 Lisandro de la Torre and others found the Democratic Progressive Party (''Partido Demócrata Progresista'', PDP) at the Hotel Savoy, Buenos Aires.
1929 The 1st Conference of the Communist Parties of Latin America is held in Buenos Aires.
1951 The first Pan American Games are held in Buenos Aires, Argentina.
1960 In Buenos Aires, Argentina, four Israeli Mossad agents capture fugitive Nazi Adolf Eichmann who is living under the alias of Ricardo Klement.
1968 74 are killed and 150 injured in a football stampede towards a closed exit in a Buenos Aires stadium.
1972 20 days after he is kidnapped in Buenos Aires, Oberdan Sallustro is executed by communist guerrillas.
1973 Ezeiza massacre in Buenos Aires, Argentina. Snipers fire upon left-wing Peronists. At least 13 are killed and more than 300 are injured.
1994 The bombing of the Asociación Mutual Israelita Argentina (Argentinian Jewish Communal Center) in Buenos Aires kills 85 people (mostly Jewish) and injures 300.
1999 A LAPA Boeing 737-200 crashes during takeoff from Jorge Newbury Airport in Buenos Aires, killing 65, including 2 on the ground.
2007 Airport police officer María del Luján Telpuk discovers a suitcase containing the undeclared sum of US$800,000 as it goes through an x-ray machine in Aeroparque Jorge Newbery in Buenos Aires, sparking an international scandal involving Venezuela and Argentina known as "Maletinazo".